in 2002. now with scientists telling the united nations that sea level is rising faster than current models predicted, this could be happening much more often. >> today's flood is going to be tomorrow's high tide. so we need to get ready for those kinds of changes. a deeper bay, a bay with bigger waves and more frequent flooding. >> california's bacon serve of servation and development area is in charge making maps showing the areas of flooding if the sea rises 16 inches, predicted for 2015 but now maybe sooner. >> believe it or not, san francisco's waterfront will be among the last parts of the bay to flood thanks in part to careful engineering. but they caution if walls like these aren't ball along other areas of the shoreline, whole communities could end up under water. >> areas like foster city. all could be under water by mid-century, maybe sooner. >> a lot of people could be displaced. this is very expensive property down here. >> you think rankin sells a lot of flights now, in a few decades the oakland and san francisco parents could be shutting down runways with every storm.